Pilot officer (Plt Off officially in the RAF; PLTOFF in the RAAF and RNZAF; formerly P/O in all services, and still often used in the RAF) is the lowest commissioned rank in the Royal Air Force[1] and the air forces of many other Commonwealth countries. It ranks immediately below flying officer. It normally denotes an officer who has elected to join as a non-graduate direct entrant officer, as those with degrees usually serve only a week at the rank after graduation from the RAF College Cranwell. Some newly commissioned officers hold the lower grade of acting pilot officer.

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In the Royal Flying Corps, officers were designated pilot officers at the end of pilot training. As they retained their commissions in their customary ranks (usually second lieutenant or lieutenant), and many of them had been seconded from their ground units, the designation of pilot officer was a position title rather than a rank.

On 1 April 1918, the newly created RAF adopted its officer rank titles from the British Army, with Royal Flying Corps second lieutenants becoming second lieutenants in the RAF. Consideration was given to renaming second lieutenants as ensigns. However, when the RAF's own rank structure was introduced on 1 August 1919, RAF second lieutenants who were qualified pilots were redesignated pilot officers, a rank which has been in continuous use ever since. Those who were not qualified pilots were redesignated observer officers, but this was later phased out and all officers of this rank became pilot officers.

The rank title does not imply that an officer in the rank of pilot officer is a pilot. Some pilot officers are aircrew, whilst many are ground branch officers. A ground branch pilot officer rarely may have command of a flight.

The rank is normally held by an officer who has joined as a non-graduate direct entrant to the RAF. Those with degrees usually serve only a week in the rank after graduation from the RAF College Cranwell. All newly commissioned non-graduate officers hold the lower grade of acting pilot officer for one year.

The rank insignia consists of a thin blue band on slightly wider black band. This is worn on both the lower sleeves of the tunic or on the shoulders of the flying suit or the casual uniform.

Although no Royal Navy rank has an insignia of a single half width ring, a pilot officer's mess insignia of one thin band of gold running around each cuff is similar to the general naval pattern. As with the mess insignia for other RAF officer ranks, the band of gold does not have the Royal Navy's loop.

The Royal Canadian Air Force used the rank until the three armed services were unified into the Canadian Forces in 1968 and army-type ranks were adopted. A Canadian pilot officer then became a second lieutenant. In official French Canadian usage, a pilot officer's rank title was sous-lieutenant d'aviation. The Royal Malaysian Air Force used "young lieutenant".